In coordination chemistry, a ligand is:
a) A metal ion
b) A negatively charged species
c) A positively charged species
d) A molecule or ion that donates electrons to a metal ion
Answer: d) A molecule or ion that donates electrons to a metal ion
The coordination number of a metal ion refers to:
a) The number of ligands bonded to the metal ion
b) The charge of the metal ion
c) The number of electrons in the metal ion’s outer shell
d) The mass of the metal ion
Answer: a) The number of ligands bonded to the metal ion
Which of the following is an example of a monodentate ligand?
a) NH3
b) H2O
c) EDTA
d) CO
Answer: a) NH3
The complex ion [Cu(NH3)4]2+ has a coordination number of:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
Which of the following ligands is classified as a chelating ligand?
a) H2O
b) NH3
c) EDTA
d) CO
Answer: c) EDTA
The coordination number of octahedral complexes is:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The complex ion [Ni(CO)4] has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4
The term “chelate effect” refers to:
a) The tendency of metal ions to form complexes with chelating ligands
b) The ability of ligands to form multiple bonds with a metal ion
c) The stability of metal-ligand bonds in coordination complexes
d) The color change observed in metal complexes
Answer: a) The tendency of metal ions to form complexes with chelating ligands
The complex ion [Co(NH3)6]3+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
Which of the following ligands is classified as a bidentate ligand?
a) H2O
b) NH3
c) EDTA
d) CO
Answer: c) EDTA
The complex ion [Fe(CN)6]4- has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “ligand exchange” refers to:
a) The process of forming coordination complexes
b) The transfer of electrons between ligands and metal ions
c) The movement of ligands in and out of coordination complexes
d) The reaction of ligands with solvent molecules
Answer: c) The movement of ligands in and out of coordination complexes
The complex ion [PtCl4]2- has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4
The term “ligand field theory” is used to describe:
a) The study of ligands and their properties
b) The theory that describes the interactions between metal ions and ligands
c) The geometry of coordination complexes
d) The theory that explains the electronic structure of metal ions
Answer: b) The theory that describes the interactions between metal ions and ligands
The complex ion [CuCl4]2- has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4
The term “cis-trans isomerism” refers to:
a) The isomerism observed in coordination complexes with different ligands
b) The isomerism observed in coordination complexes with different metal ions
c) The isomerism observed in coordination complexes with different coordination numbers
d) The isomerism observed in coordination complexes with different geometric arrangements of ligands
Answer: d) The isomerism observed in coordination complexes with different geometric arrangements of ligands
The complex ion [Pt(NH3)2Cl2] has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4
The term “isomerism” in coordination chemistry refers to:
a) The phenomenon of complexes having the same molecular formula but different structures or properties
b) The tendency of metal ions to form complexes with multiple ligands
c) The process of ligand exchange in coordination complexes
d) The stability of metal-ligand bonds in coordination complexes
Answer: a) The phenomenon of complexes having the same molecular formula but different structures or properties
The complex ion [Co(NH3)5Cl]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: c) 5
The term “chiral” in coordination chemistry refers to:
a) The ability of a ligand to form multiple bonds with a metal ion
b) The ability of a complex to rotate plane-polarized light
c) The isomerism observed in coordination complexes with different ligands
d) The process of ligand exchange in coordination complexes
Answer: b) The ability of a complex to rotate plane-polarized light
The complex ion [Cr(NH3)6]3+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “spectrochemical series” is used to describe:
a) The series of ligands arranged in order of increasing ligand field strength
b) The series of ligands arranged in order of increasing complex stability
c) The series of metal ions arranged in order of increasing coordination number
d) The series of metal ions arranged in order of increasing oxidation state
Answer: a) The series of ligands arranged in order of increasing ligand field strength
The complex ion [Fe(CN)6]3- has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “ligand substitution” refers to:
a) The process of forming coordination complexes
b) The transfer of electrons between ligands and metal ions
c) The movement of ligands in and out of coordination complexes
d) The reaction of ligands with solvent molecules
Answer: c) The movement of ligands in and out of coordination complexes
The complex ion [Cu(NH3)2(H2O)4]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “oxidation state” in coordination chemistry refers to:
a) The charge on a ligand
b) The number of ligands bonded to a metal ion
c) The number of electrons gained or lost by a metal ion in a complex
d) The stability of metal-ligand bonds in coordination complexes
Answer: c) The number of electrons gained or lost by a metal ion in a complex
The complex ion [Ni(H2O)6]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “denticity” refers to:
a) The charge on a ligand
b) The number of ligands bonded to a metal ion
c) The geometry of coordination complexes
d) The ability of a ligand to rotate plane-polarized light
Answer: b) The number of ligands bonded to a metal ion
The complex ion [Pt(NH3)2Cl4]2- has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4
The term “chelation” refers to:
a) The process of ligand exchange in coordination complexes
b) The reaction of ligands with solvent molecules
c) The ability of ligands to form multiple bonds with a metal ion
d) The ability of a complex to rotate plane-polarized light
Answer: c) The ability of ligands to form multiple bonds with a metal ion
The complex ion [Co(NH3)4Cl2]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4
The term “homoleptic complex” refers to:
a) A complex containing only one type of ligand
b) A complex containing multiple types of ligands
c) A complex with a coordination number of 6
d) A complex with a coordination number of 4
Answer: a) A complex containing only one type of ligand
The complex ion [Cr(H2O)6]3+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “coordination sphere” refers to:
a) The central metal ion in a coordination complex
b) The ligands bonded to the central metal ion
c) The arrangement of ligands around the central metal ion
d) The charge of the coordination complex
Answer: b) The ligands bonded to the central metal ion
The complex ion [Co(NH3)6]3+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “heteroleptic complex” refers to:
a) A complex containing only one type of ligand
b) A complex containing multiple types of ligands
c) A complex with a coordination number of 6
d) A complex with a coordination number of 4
Answer: b) A complex containing multiple types of ligands
The complex ion [Fe(H2O)6]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “ligand field splitting” refers to:
a) The splitting of ligands into smaller fragments
b) The splitting of energy levels in a metal ion’s d orbitals due to ligand-field interactions
c) The splitting of ligands from a coordination complex
d) The splitting of ligand-ligand bonds in a coordination complex
Answer: b) The splitting of energy levels in a metal ion’s d orbitals due to ligand-field interactions
The complex ion [Cu(H2O)4]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4
The term “chelate ring” refers to:
a) The ring-shaped structure formed by a ligand and a metal ion in a coordination complex
b) The ring-shaped structure formed by ligands in a coordination complex
c) The ring-shaped structure formed by metal ions in a coordination complex
d) The ring-shaped structure formed by ligands and solvent molecules in a coordination complex
Answer: a) The ring-shaped structure formed by a ligand and a metal ion in a coordination complex
The complex ion [Co(H2O)6]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “pi-bonding” in coordination chemistry refers to:
a) The donation of electrons from a ligand’s pi orbitals to a metal ion’s d orbitals
b) The donation of electrons from a metal ion’s d orbitals to a ligand’s pi orbitals
c) The donation of electrons from a ligand’s pi orbitals to a metal ion’s s orbitals
d) The donation of electrons from a metal ion’s s orbitals to a ligand’s pi orbitals
Answer: a) The donation of electrons from a ligand’s pi orbitals to a metal ion’s d orbitals
The complex ion [Fe(H2O)4Cl2] has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4
The term “coordination isomerism” refers to:
a) The isomerism observed in coordination complexes with different ligands
b) The isomerism observed in coordination complexes with different metal ions
c) The isomerism observed in coordination complexes with different coordination numbers
d) The isomerism observed in coordination complexes with different geometric arrangements of ligands
Answer: a) The isomerism observed in coordination complexes with different ligands
The complex ion [Cr(H2O)6]3+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “backbonding” in coordination chemistry refers to:
a) The donation of electrons from a ligand to a metal ion
b) The donation of electrons from a metal ion to a ligand
c) The donation of electrons from a ligand’s pi orbitals to a metal ion’s d orbitals
d) The donation of electrons from a metal ion’s d orbitals to a ligand’s pi orbitals
Answer: d) The donation of electrons from a metal ion’s d orbitals to a ligand’s pi orbitals
The complex ion [Co(H2O)6]3+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “complex stability constant” refers to:
a) The charge on a ligand
b) The tendency of a metal-ligand complex to dissociate into its components
c) The stability of metal-ligand bonds in coordination complexes
d) The ability of a complex to rotate plane-polarized light
Answer: b) The tendency of a metal-ligand complex to dissociate into its components
The complex ion [Cr(H2O)6]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “trans-effect” in coordination chemistry refers to:
a) The tendency of ligands to form multiple bonds with a metal ion
b) The ability of a complex to rotate plane-polarized light
c) The ability of a ligand to affect the binding of other ligands in a coordination complex
d) The splitting of energy levels in a metal ion’s d orbitals due to ligand-field interactions
Answer: c) The ability of a ligand to affect the binding of other ligands in a coordination complex
The complex ion [Fe(H2O)6]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “d-d transition” refers to:
a) The transition of an electron from a metal ion’s d orbitals to a ligand’s pi orbitals
b) The transition of an electron from a ligand’s pi orbitals to a metal ion’s d orbitals
c) The transition of an electron between different d orbitals of a metal ion
d) The transition of an electron between different energy levels in a metal ion’s d orbitals
Answer: c) The transition of an electron between different d orbitals of a metal ion
The complex ion [Co(H2O)6]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “infrared spectroscopy” is commonly used in coordination chemistry to:
a) Determine the electronic structure of metal-ligand complexes
b) Determine the coordination number of metal-ligand complexes
c) Study the ligand field splitting in metal-ligand complexes
d) Characterize the vibrational modes of metal-ligand complexes
Answer: d) Characterize the vibrational modes of metal-ligand complexes
The complex ion [Ni(H2O)6]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “paramagnetic” in coordination chemistry refers to:
a) The tendency of a complex to rotate plane-polarized light
b) The tendency of a complex to form chelate rings
c) The tendency of a complex to exhibit magnetic properties due to unpaired electrons
d) The tendency of a complex to undergo ligand substitution reactions
Answer: c) The tendency of a complex to exhibit magnetic properties due to unpaired electrons
The complex ion [Fe(H2O)6]3+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “ligand field stabilization energy” refers to:
a) The stability of metal-ligand bonds in coordination complexes
b) The energy difference between the highest occupied and lowest unoccupied molecular orbitals of a metal-ligand complex
c) The energy difference between the metal ion’s d orbitals before and after ligand binding
d) The stability of metal-ligand complexes in solution
Answer: c) The energy difference between the metal ion’s d orbitals before and after ligand binding
The complex ion [Cu(H2O)6]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “UV-visible spectroscopy” is commonly used in coordination chemistry to:
a) Determine the electronic structure of metal-ligand complexes
b) Determine the coordination number of metal-ligand complexes
c) Study the ligand field splitting in metal-ligand complexes
d) Characterize the vibrational modes of metal-ligand complexes
Answer: a) Determine the electronic structure of metal-ligand complexes
The complex ion [Cr(H2O)6]3+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “spin crossover” in coordination chemistry refers to:
a) The phenomenon of complexes having the same molecular formula but different structures or properties
b) The phenomenon of ligands undergoing redox reactions in coordination complexes
c) The phenomenon of complexes exhibiting different magnetic properties at different temperatures
d) The phenomenon of complexes exhibiting different optical properties in different solvents
Answer: c) The phenomenon of complexes exhibiting different magnetic properties at different temperatures
The complex ion [Co(H2O)6]3+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “ligand substitution reaction” refers to:
a) The process of forming coordination complexes
b) The transfer of electrons between ligands and metal ions
c) The movement of ligands in and out of coordination complexes
d) The reaction of ligands with solvent molecules
Answer: c) The movement of ligands in and out of coordination complexes
The complex ion [Fe(H2O)6]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “crystal field splitting” refers to:
a) The splitting of ligands into smaller fragments
b) The splitting of energy levels in a metal ion’s d orbitals due to crystal-field interactions
c) The splitting of ligands from a coordination complex
d) The splitting of ligand-ligand bonds in a coordination complex
Answer: b) The splitting of energy levels in a metal ion’s d orbitals due to crystal-field interactions
The complex ion [Cu(H2O)4]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4
The term “coordination compound” refers to:
a) A compound formed from the reaction of a metal ion with a ligand
b) A compound formed from the reaction of a metal ion with a nonmetal
c) A compound formed from the reaction of a ligand with a nonmetal
d) A compound formed from the reaction of two or more ligands
Answer: a) A compound formed from the reaction of a metal ion with a ligand
The complex ion [Co(H2O)6]2+ has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6
The term “bridging ligand” refers to:
a) A ligand that forms multiple bonds with a metal ion
b) A ligand that binds to two or more metal ions in a coordination complex
c) A ligand that binds to a metal ion and a nonmetal atom in a coordination complex
d) A ligand that binds to a metal ion and another ligand in a coordination complex
Answer: b) A ligand that binds to two or more metal ions in a coordination complex
